Sony BRAVIA Theatre Bar 9 Help Manual page 31

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A software update may be required when using the speaker system with the optional speakers. Perform the software update while

the speaker system and the optional speakers are connected to a power source.

If changing the installation method or position of the speaker system or optional speakers

Perform [Sound Field Optimization](*) on the app in the following cases.

Changing the position and installation method of the speaker system as well as the optional rear speakers and

subwoofer

When changing your daily viewing position

When changing the viewing environment, such as changing the layout of furniture

Displayed when you tap [Settings] - [Sound Settings] - [Sound Field Optimization] on the remote control screen on the app.

Bravia theatre bar 8